const express = require('express');
const bodyParser = require('body-parser');
const fs = require('fs')
const cors=require('cors')

const app = express();

app.use(bodyParser.urlencoded({extended:false}));
app.all('*', function(req, res, next) {
    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Headers", "Content-Type,Content-Length, Authorization, Accept,X-Requested-With");
    res.header("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS");
    res.header("X-Powered-By",' 3.2.1')
    if(req.method=="OPTIONS") res.send(200);/*让options请求快速返回*/
    else  next();
});
app.listen(3001,()=>{console.log(3001)})


app.get('/getJSON',(req,res)=>{
    fs.readFile('./myjson.json','utf-8',(err,data)=>{
        if(err) {
            console.log(err)
        }else{
            res.send(data)
        }
    })
})